After messing around trying to find a way to do mobile blogging it seems that the simplest way is the most obvious. The combination of the email blogging capabillity of Blogger with the ease and incredible portability of the Blackberry.
The one thing that is missing is the ability to edit. Some of the other solutions such a HBlogger do provide editing ability. There is a bit more overhead involved with that than simply firing an email off to your secret Blogger address.
Since I have both, I mean look at the name of my blog, I will end up using both. I suspect for quick posts it will be hard to beat the Blackberry. While you can save posts with HBlogger of course, it still requires the actual process of hooking up. This is based on my setup which is a Palm T5. With a Treo as hardware HBlogger might be more similar to emailing from the Blackberry in terms of ease of use.
GadgetFreak